"Where are the circumbinary planets? Survival of planets around shrinking binaries"

Despite the large number of compact eclipsing binaries in the Kepler target list, no transiting planets have been found around binaries with orbital periods smaller than 7 days. Most of these short-period binaries are thought not to be primordial, but to have evolved from wider orbits into their current configurations via tidal dissipation mediated by Lidov-Kozai cycles. In this talk, I will describe the orbital evolution of planets around binaries as they are shrunk by Kozai cycles with tidal friction. I will show how circumbinary planets can be ejected by secular excitation of their eccentricities and inclinations as the inner binary reduces its orbital period from 1-2 months to ~5 days owing to tidal dissipation. This process offers an explanation to the absence of Kepler planet candidates around very compact binaries.